Introduction to French (for white)
MAIN LINES WITH 3.Nc3

---------
Classical
---------

1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Nfd7 
      6.Bxe7 Qxe7 7.f4 (main line)
            7... 0–0 8.Nf3 c5 9.dxc5 Nc6 10.Qd2 f6 11.exf6 Qxf6 12.g3 Nxc5 13.0–0–0 
            7... a6 8.Nf3 c5 9.dxc5 Nc6 10.Qd2 Qxc5 11.Bd3 b5 12.a3 Bb7 13.Ne2 0–0 
                  14.Ned4 Nxd4 15.Nxd4 
      6.h4 (Alekhine-Chatard attack)
            6... Bxg5 7.hxg5 Qxg5 8.Qd3 Nf8 9.Nf3 Qe7 10.0–0–0 
            6... c5 7.Bxe7 Kxe7 (Qxe7 allows Nb5) 8.Qg4 Kf8 9.Nf3 Nc6 10.dxc5 Ndxe5 
                  11.Nxe5 Nxe5 12.Qg3 
            6... 0–0 7.Bd3 c5 8.Qg4 Re8 9.Bxe7 Qxe7 10.Nf3 cxd4 11.Nxd4 Nxe5 12.Bxh7+ Kxh7 
                  13.Qh5+ Kg8 14.Qxe5 Nd7 15.Qg3 

--------------
Tactical lines
--------------

1.e4 e6 2.d4 d5 3.Nc3 
       3... Bb4 4.e5 (Winawer variation)
             4... Ne7 5.a3 Bxc3+ 6.bxc3 b6 7.Qg4 Ng6 8.h4 h5 9.Qd1 Ba6 10.Bxa6 Nxa6 11.Bg5 Qd7 12.Ne2 
             4... c5 5.a3 Ba5 6.b4 cxd4 7.Qg4 Ne7 8.bxa5 dxc3 9.Qxg7 Rg8 10.Qxh7 Nbc6 11.f4 Qxa5 
                   12.Nf3 Bd7 13.Rb1 0–0–0 14.Qd3 
             4... c5 5.a3 Bxc3+ 6.bxc3 Ne7 7.Qg4 
                   7... 0–0 8.Bd3 (Old line)
                         8... Nbc6 9.Qh5 Ng6 10.Nf3 Qc7 11.Be3 c4 12.Bxg6 fxg6 13.Qg4 
                         8... Qa5 9.Bd2 Nbc6 10.Nf3 f5 11.exf6 Rxf6 12.Qh5 Nf5 13.c4  
                         8... f5 9.exf6 Rxf6 10.Bg5 Rf7 11.Qh5 g6 12.Qd1 Nbc6 13.Nf3 
                   7... Qc7 8.Qxg7 Rg8 9.Qxh7 cxd4 10.Ne2 Nbc6 (Poisoned-pawn variation) 11.f4
                         11... Bd7 12.Qd3 dxc3 13.Nxc3 a6 14.Rb1 Rc8 15.h4 Nf5 16.Rh3 
                         11... dxc3 12.Qd3 d4 13.Ng3 Bd7 14.Ne4 0–0–0 15.Rb1 
       3... Nf6 4.Bg5 Bb4 5.e5 h6 6.Bd2 Bxc3 7.Bxc3 Ne4 8.Ne2 (MacCutcheon variation)
             8... Nc6 9.Nf4 Qe7 10.Bd3 Nxc3 11.bxc3 Bd7 12.Nh5 Rg8 13.0–0 0–0–0 14.Rb1
             8... c5 9.dxc5 Nxc3 10.Nxc3 0–0 11.Qd2 Nc6 12.f4 f6 13.exf6 Qxf6 14.g3 Qe7 
                   15.0–0–0 Qxc5 16.Kb1 

----------------
Positional lines
----------------

1.e4 e6 2.d4 d5 3.Nc3
      3... dxe4 4.Nxe4 (Rubinstein variation)
            4... Bd7 5.Nf3 Bc6 6.Bd3 Nd7 7.Qe2 Ngf6 8.0–0 Nxe4 9.Bxe4 Bxe4 10.Qxe4 c6 11.c4
            4... Nd7 5.Nf3 Ngf6 6.Nxf6+ Nxf6 7.Bd3 
                  7... c5 8.dxc5 Bxc5 9.Qe2 0–0 10.Bg5 h6 11.Bh4
                  7... b6 8.Qe2 Bb7 9.Bg5 Be7 10.0–0–0
      3... Nf6 4.Bg5 dxe4 5.Nxe4 (Burn variation)
            5... Be7 6.Bxf6 Bxf6 7.Nf3 0–0 8.Qd2 Nd7 9.0–0–0 
            5... Nbd7 6.Nf3 Be7 7.Nxf6+ Bxf6 8.h4 h6 9.Bxf6 Qxf6 10.Qd2 0–0 11.0–0–0